Data output apparatus, data output method, and data generation method
A data output apparatus includes: a video decoder that decodes a video stream to generate a first video signal; an external metadata acquisition unit that acquires one or more pieces of metadata corresponding to one or more first conversion modes; an HDR metadata interpreter that interprets one of the one or more pieces of metadata to acquire characteristic data and conversion auxiliary data; a DR converter that supports one or more second conversion modes and performs conversion processing of a luminance range of the first video signal based on the conversion auxiliary data to generate a second video signal; and an HDMI output unit that outputs the second video signal to a display apparatus.
1. A data output apparatus comprising:
a decoder that decodes a video stream to generate a first video signal;
an acquirer that acquires one or more pieces of metadata corresponding to one or more first conversion modes in which a luminance range of a video signal is converted;
an interpreter that interprets one of the one or more pieces of metadata to acquire characteristic data indicating a luminance range of the first video signal, and conversion auxiliary data for converting the luminance range of the first video signal;
a control information generator that converts the characteristic data into control information according to a predetermined transmission protocol;
a converter that supports one or more second conversion modes in which a luminance range of a video signal is converted, the converter for performing conversion processing of the luminance range of the first video signal in one of the one or more second conversion modes based on the conversion auxiliary data to generate a second video signal with a luminance range narrower than the luminance range of the first video signal; and
an outputter that outputs the second video signal and the control information to a display apparatus in accordance with the transmission protocol,
wherein the interpreter further determines which of the data output apparatus and the display apparatus is to perform the conversion processing, based on the one or more first conversion modes, the one or more second conversion modes, and one or more third conversion modes in which a luminance range of a video signal is converted, the one or more third conversion modes being supported by the display apparatus,
the interpreter further determines a conversion mode which is included in the one or more first conversion modes and is included in at least one of the one or more second conversion modes and the third conversion modes, as a conversion mode of the conversion processing to be performed by the data output apparatus or the display apparatus,
the acquirer acquires a plurality of pieces of metadata corresponding to a plurality of first conversion modes including the one or more first conversion modes,
the converter supports a plurality of second conversion modes including the one or more second conversion modes, and
the interpreter determines, as a conversion mode of the conversion processing to be performed by the data output apparatus or the display apparatus, a conversion mode with highest reproducibility for a master image which is an image that is output without conversion of the luminance range, from among a plurality of conversion modes which are included in the plurality of first conversion modes, and are included in at least one of the plurality of second conversion modes and the third conversion modes.
2. The data output apparatus according to claim 1 , wherein
the converter comprises a plurality of mode processors that support the plurality of second conversion modes on a one-to-one basis, and perform processing of the supported second conversion modes.
3. The data output apparatus according to claim 1 , wherein the converter comprises:
a basic processor that performs processing common to the one or more second conversion modes; and
one or more extended mode processors that support the one or more second conversion modes on a one-to-one basis, and perform processing of the supported second conversion modes.
4. The data output apparatus according to claim 1 , wherein the interpreter further determines a conversion mode which is included in the one or more first conversion modes and is included in the one or more second conversion modes, as a conversion mode of the conversion processing to be performed by the data output apparatus.
5. The data output apparatus according to claim 1 , wherein, when the determined conversion mode of the conversion processing is included in the second conversion modes and is not included in the third conversion modes, the interpreter determines that the data output apparatus is to perform the conversion processing.
6. The data output apparatus according to claim 1 , wherein, when the determined conversion mode of the conversion processing is included in the third conversion modes and is not included in the second conversion modes, the interpreter determines that the display apparatus is to perform the conversion processing.
7. The data output apparatus according to claim 1 , wherein the interpreter further determines the conversion mode of the conversion processing to be performed by the data output apparatus or the display apparatus, according to whether a parameter for each of the plurality of first conversion modes is acquirable from the display apparatus.
8. The data output apparatus according to claim 7 , wherein the interpreter determines, as a conversion mode of the conversion processing to be performed by the data output apparatus or the display apparatus, a conversion mode which is included in the plurality of first conversion modes, is included in at least one of the plurality of second conversion modes and the third conversion modes, and for which the parameter is acquirable from the display apparatus.
9. The data output apparatus according to claim 7 , wherein the parameter indicates a maximum value of a displayable luminance range of the display apparatus or a displayable display mode of the display apparatus.
10. The data output apparatus according to claim 1 , further comprising a down converter that generates a third video signal by lowering resolution of the first video signal, wherein
the outputter further outputs the third video signal to the display apparatus.
11. The data output apparatus according to claim 10 , wherein
the converter further performs the conversion processing of a luminance range of the third video signal based on the conversion auxiliary data in one of the one or more second conversion modes to generate a fourth video signal with a luminance range narrower than the luminance range of the third video signal, and
the outputter further outputs the fourth video signal to the display apparatus.
12. The data output apparatus according to claim 10 , wherein, when the display apparatus does not support display of a video with the resolution of the first video signal,
(1) the down converter generates the third video signal, and
(2) the outputter outputs the third video signal to the display apparatus.
13. The data output apparatus according to claim 1 , wherein, when the display apparatus does not support display of a video with the luminance range of the first video signal,
(1) the converter generates the second video signal, and
(2) the outputter outputs the second video signal and the control information to the display apparatus.
14. A data output method in a data output apparatus, the data output method comprising:
a decoding step of decoding a video stream to generate a first video signal;
an acquisition step of acquiring one or more pieces of metadata corresponding to one or more first conversion modes in which a luminance range of a video signal is converted;
an interpretation step of interpreting one of the one or more pieces of metadata to acquire characteristic data indicating a luminance range of the first video signal, and conversion auxiliary data for converting the luminance range of the first video signal;
a control information generation step of converting the characteristic data into control information according to a predetermined transmission protocol;
a conversion step of generating a second video signal with a luminance range narrower than the luminance range of the first video signal, by a converter that supports one or more second conversion modes in which a luminance range of a video signal is converted and performs conversion processing of the luminance range of the first video signal in one of the one or more second conversion modes based on the conversion auxiliary data; and
an output step of outputting the second video signal and the control information to a display apparatus in accordance with the transmission protocol,
wherein the interpretation step further comprises determining which of the data output apparatus and the display apparatus is to perform the conversion processing, based on the one or more first conversion modes, the one or more second conversion modes, and one or more third conversion modes in which a luminance range of a video signal is converted, the one or more third conversion modes being supported by the display apparatus,
the interpretation step further comprises determining a conversion mode which is included in the one or more first conversion modes and is included in at least one of the one or more second conversion modes and the third conversion modes, as a conversion mode of the conversion processing to be performed by the data output apparatus or the display apparatus,
the acquisition step comprises acquiring a plurality of pieces of metadata corresponding to a plurality of first conversion modes including the one or more first conversion modes,
the converter supports a plurality of second conversion modes including the one or more second conversion modes, and
the interpretation step further comprises determining, as a conversion mode of the conversion processing to be performed by the data output apparatus or the display apparatus, a conversion mode with highest reproducibility for a master image which is an image that is output without conversion of the luminance range, from among a plurality of conversion modes which are included in the plurality of first conversion modes, and are included in at least one of the plurality of second conversion modes and the third conversion modes.
15. A non-transitory computer-readable recording medium storing a program for causing a computer to execute the data output method according to claim 14 .
16. A data output apparatus comprising:
a decoder that decodes a video stream to generate a first video signal;
an acquirer that acquires one or more pieces of metadata corresponding to one or more first conversion modes in which a luminance range of a video signal is converted;
an interpreter that (i) interprets one of the one or more pieces of metadata to acquire characteristic data indicating a luminance range of the first video signal, and conversion auxiliary data for converting the luminance range of the first video signal, and (ii) determines which of the data output apparatus and a display apparatus is to perform a conversion processing, based on the one or more first conversion modes, one or more second conversion modes in which a luminance range of a video signal is converted, the one or more second conversion modes being supported by the data output apparatus, and one or more third conversion modes in which a luminance range of a video signal is converted, the one or more third conversion modes being supported by the display apparatus;
a control information generator that converts the characteristic data into control information according to a predetermined transmission protocol;
a converter that converts the luminance range of the first video signal in one of the one or more second conversion modes based on the conversion auxiliary data to generate a second video signal with a luminance range narrower than the luminance range of the first video signal, when the interpreter determines the data output apparatus is to perform the conversion processing; and
an outputter that outputs the second video signal and the control information to a display apparatus in accordance with the transmission protocol,
wherein the interpreter further determines which of the data output apparatus and the display apparatus is to perform the conversion processing, based on the one or more first conversion modes, the one or more second conversion modes, and one or more third conversion modes in which a luminance range of a video signal is converted, the one or more third conversion modes being supported by the display apparatus,
the interpreter further determines a conversion mode which is included in the one or more first conversion modes and is included in at least one of the one or more second conversion modes and the third conversion modes, as a conversion mode of the conversion processing to be performed by the data output apparatus or the display apparatus,
the acquirer acquires a plurality of pieces of metadata corresponding to a plurality of first conversion modes including the one or more first conversion modes,
the converter supports a plurality of second conversion modes including the one or more second conversion modes, and
the interpreter determines, as a conversion mode of the conversion processing to be performed by the data output apparatus or the display apparatus, a conversion mode with highest reproducibility for a master image which is an image that is output without conversion of the luminance range, from among a plurality of conversion modes which are included in the plurality of first conversion modes, and are included in at least one of the plurality of second conversion modes and the third conversion modes.